本题目来源于试卷: 美国2021年物理杯赛真题 PHYSICS BOWL 2021，类别为 美国物理杯赛(Physics Bowl)
[单选题]
The Joule (J) is a derived unit of energy in the International System of Units. It is equal to which of the following
A. $kg(\frac{m}{s})$
B. $kg(\frac{m}{s^2})$
C. $kg(\frac{m^2}{s})$
D. $kg(\frac{m^2}{s^2})$
E. $kg(\frac{m^2}{s^3})$
参考答案: D
本题详细解析:
A Joule is the SI unit of work or energy, equal to the work done by a force of one
newton when its point of application moves one meter in the direction of action of the
force. $J=N \times m= kg \frac{m}{s^2} \times m = kg(\frac{m^2}{s^2})$
| 
